Groove-cutter.



No. 693,508. I Patented Feb. 18, I902. HPW. A. FETTE.

GROOVE CUTTER.

(Application filed July 8, IQOIJ (Model) "rrnn dramas ATENT Prion.

GROOVE CUTTER.

SEEGIFIQATIQN formingpart of Letters Patent N 0. 693,508, dated February18, 1902. Application filed July 8, 1901. Serial No. 67,387. (ModeL) Toall whom, it may concern.-

Be it known that I, HEINRICH WILHELM ADOLF FETTE, a citizen of theGerman Empire, and a resident of Altona-Ottensen, Germany, have inventedcertain new and useful Improvements in Groove-Cutters, of which thefollowing is a specification.

This invention relates to an improved tool for cutting grooves intometallic work-pieces.

It consists in the features of construction fully pointed out in theclaims.

In the accompanying drawings, Figures 1 and 2 represent a cutter withtwo angular edges. Figs. 3 and at show a cutter with four angular edges;and Figs. 5 and 6 represent a cutter with three angular edges, Figs. 1,3, and 5 being side elevations and Figs. 2, 4, and 6 end elevations.

The letter 0 represents the body of the groove-cutter, the working endof which is divided into longitudinal arms 9 by means of interveninglongitudinal grooves 61. One edge h of each arm is straight or parallelto the axis of the tool and constitutes a cutting edge. The other edge hof each arm is curved so that each groove (Z gradually widens toward theend of the tool. This widening of the grooves is such that at the basethe core is entirely removed from the tool, so that here each arm g isseparated at the center from the adjoining arms and is triangular incrosssection. In this way there is formed upon each arm an inner cuttingedge I), the edges 1) of the several arms meeting at an apex f. Each armg is backed off at its periphery, and the base of each arm is alsobacked off to form a third cutting edge a, the cutting edges h, Z), anda for each arm being all arranged in one and the same plane. When I usecutters with two arms, the grooves form at f perfoot sectors of aboutninety degrees, with four arms about forty-five degrees, and with threearms about sixty degrees.

The operation is as follows: The tool is se cured to the spindle of aboring-bench, cutting-machine, 0r lathe and is rotated. It is firstbored into the work-piece at right angles to the groove to be cut, suchboring operation being effected by the cutting edges a and Z). After thetool has been sunk into the workpiece to a depth equal to the height ofthe groove desired the work-piece is fed at right angles to the axis ofthe tool. During this operation the groove will be cut by theaxially-extending cutting edges h of the rotating tool.

I claim- 1. A groove-cutter provided with a number oflongitudinally-extending arms, and intervening grooves, the arms beingseparated from each other at their ends and provided with three cuttingedges, substantially as specified.

2. A groove-cutter provided with a number of longitudinally-extendingarms having one straight edge and one curved edge to form interveninggrooves, the ends of the arms being separated from each other to form aninner cutting edge upon each arm, substantially as specified.

Signedby me at Hamburg this June, 1901.

HEINRICH WILHELM ADOLF FE'lTE.

Witnesses:

F. POTHS, E. H. L. MUMMENHOFF.

22d day of

